remove no longer relevant build status badge

Since no longer uses git.doit CI for builds, showing the status of that build no longer useful in README.

README.md

 # MyUW root webapp
 
-[![build status](https://git.doit.wisc.edu/ci/projects/15/status.png?ref=master)](https://git.doit.wisc.edu/ci/projects/15?ref=master)
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 This is the root context of myuw. It is just here to serve up some static html pages for 500 and 400 level errors.
 
 ## Development